Fix match_body return value

it could return "true" for errors (which are negative, internally)

src/vmod_re.c

@@ -753,7 +753,7 @@ reip_match_body(struct re_iter_priv *reip, struct vmod_re_regex *re,
 
 	r = reip->ret;
 	memset(reip, 0, sizeof *reip);
-	return (r);
+	return (r > 0);
 }
 
 VCL_BOOL